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Greenfiber FRM Insulation for SANCTUARY® Two-Hour Firewall Assembly

When used in combination with our proprietary U370 firewall design — the SANCTUARY Two-Hour Firewall — our Greenfiber FRM Insulation meets the requirements for a two-hour fire rating, making it ideal for townhome and multifamily construction. Rated by Underwriters Laboratory, our U370 firewall works together with Greenfiber FRM Insulation to achieve defect-free installation. Two opposing and offset studded walls create an 8" cavity into which FRM is spray-applied, filling the entire cavity and reduces air filtration in the assembly.1 

  • Bag Size 30 lbs.

Applications

  • Walls
  • Ceilings

Certifications

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Product Features

  • Two-Hour Fire Resistance Rating2Because Greenfiber FRM insulation is sprayed in after the roof goes up, conventional framing is possible. That means, in addition to being protected from the elements, the SANCTUARY Two-Hour Firewall allows all trades to work simultaneously, which normalizes the sequence of construction.
  • Meets Stringent Code Requirements2To meet stringent energy efficiency codes, the SANCTUARY Two-Hour Firewall uses spray-applied Greenfiber FRM Insulation that completely fills gaps, voids and hard-to-reach places, reducing unintended airflow. This high-performance system helps achieve 3 ACH50, lowering air changes per hour and eliminating costly customer callbacks.
  • Best-in-Class Sound-Blocking Firewall2Because the SANCTUARY Two-Hour Firewall fills gaps so completely, sounds and odors are blocked between neighboring units. Homeowners have much more control over their own indoor air quality, which allows them to live more comfortably.

Testimonials

Real customers. Real results.

See how Greenfiber cellulose insulation is helping contractors, builders, architects and homeowners create quieter, more efficient and more sustainable spaces. 

Eric Crane

Owner Advanced Thermal Concepts

Chris Little, CEO

eleV8 Builders

Kevin Campbell, Homeowner

We are LOVING the product. It is very clean and machine friendly, which is why we are probably getting better coverage.

Mike Cheschi

American Building Systems